/// <summary>
/// Initializes a new instance of the <see cref="ExpressionObserver"/> class.
/// </summary>
/// <param name="root">The root object.</param>
/// <param name="expression">The expression.</param>
public ExpressionObserver(object root, string expression)
{
Contract.Requires <ArgumentNullException>(expression != null);
_root = root;
if (!string.IsNullOrWhiteSpace(expression))
{
_node = ExpressionNodeBuilder.Build(expression);
}
Expression = expression;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionObserver"/> class.
/// </summary>
/// <param name="rootGetter">A function which gets the root object.</param>
/// <param name="expression">The expression.</param>
public ExpressionObserver(Func <object> rootGetter, string expression)
{
Contract.Requires <ArgumentNullException>(rootGetter != null);
Contract.Requires <ArgumentNullException>(expression != null);
_rootGetter = rootGetter;
if (!string.IsNullOrWhiteSpace(expression))
{
_node = ExpressionNodeBuilder.Build(expression);
}
Expression = expression;
}